adds case when Week.all is empty
removes test folder from exclude folders
removes tests for removed helpers
adds updateStats method

that calls calculateStats
removes unnecessary save
calls Day#updateTotals instead of #calculateTotals
removes unnecessary calculateTotals
removes unnecessary save
encapsulates in week#updateStats call
adds #updateStats methods

to encapsulate #calculateTotals, persistence and week#updateStats
updates week only if day is well registered
removes front end views

just json.jbuilders were left
removes front-end logic from models
moves #calculateStats to private
moves #calculateStats to private
removes assets and helpers
removes helper
removes test for helpers
removes #root
leaves just necessary fields on json.builders